P25杂化炭膜的制备及其气体分离性能  

Preparation and Gas Separation Performance of P25 Hybrid Carbon Membranes

作　　者：孙美悦[1] 李琳[1,2] 张萍萍[1] 徐家家[1] 郁焦竹[1] 王同华[1,2] 

机构地区：[1]大连理工大学化工学院精细化工国家重点实验室炭材料研究室,大连116024 [2]大连理工大学化工学院膜科学与技术研究开发中心,大连116024

出　　处：《无机材料学报》2013年第5期485-490,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(20776024;20976021;20836006;21176036);国家863计划项目(2009AA03Z215;2012AA03A611)~~

摘　　要：通过在炭膜前驱体中添加纳米二氧化钛-P25粒子制备了P25杂化炭膜,并采用TG、SEM、TEM、XRD、气体渗透性能测试等表征方法探讨添加P25纳米粒子对杂化炭膜的热解过程、微观结构及气体渗透性能的影响。结果表明,P25纳米粒子的加入提高了聚合物膜的热稳定性;P25粒子因团聚形成一定的堆积间隙并与炭基体形成了界面孔隙。气体渗透性能测试表明,P25的引入显著地提高了气体渗透通量,并随添加量增加提高而更加明显,气体选择性略有降低,分离机理仍以分子筛分为主;炭化终温的提高可以显著增加气体选择性,但气体渗透性有所降低。当P25添加量为20wt%,炭化终温为700℃时,所制备的杂化炭膜其H2、CO2、O2、N2、CH4气体渗透性分别为1769.2、1558.6、410.2、55.5和26.8 Barrer。P25 hybrid carbon membranes were prepared by adding the commercial P25 particles into the precursor. Effects of P25 particles on the pyrolysis, carbon structure and gas separation performance of hybrid carbon membranes were characterized by means of TG, SEM, TEM and XRD. The results indicate that the thermal stability of polymer precursor is improved by the incorporation of P25 particles. Gas separation performances of hybrid carbon membrane are greatly improved with the addition of P25 particles due to the accumulate voids formed by the agglomeration of P25 particles and interfacial pores formed between P25 particles and carbon matrix. Molecular sieve mechanism is still conformed in the gas separation of hybrid carbon membranes. Gas permeability increases and gas selectivity remains with the increase of P25 loading. And the gas permeability reduces and gas selectivity increases as final carbonization temperature rises. The permeabilities of H2, CO2, O2, N2 and CH4 are 1769.2, 1558.6, 410.2, 55.5, 26.8 Barrer, respectively, for the hybrid carbon membrane prepared with 20wt% P25 loading and at 700℃ carbonization temperature.

关 键 词：炭膜 气体分离 杂化炭膜 二氧化钛 

分 类 号：TQ174[化学工程—陶瓷工业]